.dt-main {
  box-flex: 1;
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;

  -ms-flex-preferred-size: auto;
  flex-basis: auto;

  overflow: auto;

  -webkit-box-sizing: border-box;
  box-sizing: border-box;

  padding: 20px;
}